Articles | Volume 24, issue 3
https://doi.org/10.5194/hess-24-1293-2020
https://doi.org/10.5194/hess-24-1293-2020
Research article
 | 
19 Mar 2020
Research article |  | 19 Mar 2020

Groundwater mean residence times of a subtropical barrier sand island

Harald Hofmann, Dean Newborn, Ian Cartwright, Dioni I. Cendón, and Matthias Raiber

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Cited articles

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Atkinson, A. P., Cartwright, I., Gilfedder, B. S., Cendón, D. I., Unland, N. P., and Hofmann, H.: Using 14C and 3H to understand groundwater flow and recharge in an aquifer window, Hydrol. Earth System Sciences, 18, 4951–4964, https://doi.org/10.5194/hess-18-4951-2014, 2014. a
Audet, P., Gravina, A., Glenn, V., McKenna, P., Vickers, H., Gillespie, M., and Mulligan, D.: Structural development of vegetation on rehabilitated North Stradbroke Island: Above/belowground feedback may facilitate alternative ecological outcomes, Ecol. Process., 2, 2192–1709, 2013. a
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Short summary
Fresh groundwater (GW) on barrier islands is affected by GW use and precipitation variability. Mean residence times (MRTs) of GW on a sand barrier island were determined. They ranged from 37 years to more than 150 years for tritium and had a much larger range (modern to 5000 years) for carbon-14. Perched aquifer systems in the unsaturated zone and peat formations around wetlands are the most likely cause of longer MRTs, as they have a significant impact on regional recharge and flow diversion.
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